Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual a distância que o cavalo vencedor correu no Summer Doldrums.
 ###Tabelas: CREATE TABLE nominees (nominees_id AUTO_INCREMENT PRIMARY KEY, Year (Ceremony) VARCHAR, Actor/Actress VARCHAR, Category VARCHAR, Film title used in nomination VARCHAR, Result VARCHAR) CREATE TABLE belmont_stakes_feature_key_prep_races_list (belmont_stakes_feature_key_prep_races_list_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Track VARCHAR, Race VARCHAR, Distance VARCHAR, Surface track VARCHAR, Winning horse VARCHAR, Winning jockey VARCHAR) CREATE TABLE most-visited_countries_by_international_tourist_arrivals (most-visited_countries_by_international_tourist_arrivals_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Country VARCHAR, UNWTO Region VARCHAR, International tourist arrivals (2012) VARCHAR, International tourist arrivals (2011) VARCHAR, Change (2011 to 2012) VARCHAR, Change (2010 to 2011) VARCHAR) CREATE TABLE junior_under-20_women (junior_under-20_women_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Fastest time (s) VARCHAR, Wind (m/s) VARCHAR, Athlete VARCHAR, Nation VARCHAR, Date VARCHAR, Location VARCHAR) CREATE TABLE earnings (earnings_id AUTO_INCREMENT PRIMARY KEY, Year INT, Regional GVA INT, Agriculture INT, Industry INT, Services INT)  
SELECT Distance FROM belmont_stakes_feature_key_prep_races_list WHERE Winning horse = summer doldrums